Derivative Instruments - Financial Instruments for Hedging Volume (Detail)	Mar. 31, 2020 $ / unit bbl
Derivative, Swap Type | Oil (Bbls) | April – December 2020
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	4,034,000
Weighted Average Price (usd per unit) | $ / unit	57.48
Derivative, Swap Type | Oil (Bbls) | For the year 2021
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	3,007,500
Weighted Average Price (usd per unit) | $ / unit	54.71
Derivative, Swap Type | Oil (Bbls) | For the year 2022
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	0
Weighted Average Price (usd per unit) | $ / unit	0
Swaption | April – December 2020
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	0
Weighted Average Price (usd per unit) | $ / unit	0
Swaption | For the year 2021
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	0
Weighted Average Price (usd per unit) | $ / unit	0
Swaption | For the year 2022
Derivative Instruments, Gain (Loss) [Line Items]
Hedge backed oil volume | bbl	1,092,000
Weighted Average Price (usd per unit) | $ / unit	55.08